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-rw-r--r--src/engine.cpp5
-rw-r--r--src/engine.h2
2 files changed, 4 insertions, 3 deletions
diff --git a/src/engine.cpp b/src/engine.cpp
index c6b776667..d1475602d 100644
--- a/src/engine.cpp
+++ b/src/engine.cpp
@@ -91,8 +91,9 @@ static void CalcEngineReliability(Engine *e)
/* Check for early retirement */
if (e->player_avail != 0 && !_patches.never_expire_vehicles) {
- uint retire_early = EngInfo(e - _engines)->retire_early;
- if (retire_early > 0 && age >= e->duration_phase_1 + e->duration_phase_2 - retire_early * 12) {
+ int retire_early = EngInfo(e - _engines)->retire_early;
+ uint retire_early_max_age = max(0, e->duration_phase_1 + e->duration_phase_2 - retire_early * 12);
+ if (retire_early != 0 && age >= retire_early_max_age) {
/* Early retirement is enabled and we're past the date... */
e->player_avail = 0;
AddRemoveEngineFromAutoreplaceAndBuildWindows(e->type);
diff --git a/src/engine.h b/src/engine.h
index 66eb97b17..67ddf9996 100644
--- a/src/engine.h
+++ b/src/engine.h
@@ -110,7 +110,7 @@ struct EngineInfo {
byte refit_cost;
byte misc_flags;
byte callbackmask;
- byte retire_early; ///< Number of years early to retire vehicle
+ int8 retire_early; ///< Number of years early to retire vehicle
StringID string_id; ///< Default name of engine
};